BIO: Mark Hanna is an Extension Agricultural Engineer with Iowa State University. He conducts adult education and applied research with agricultural field machinery including the areas of tillage, seeding, application, harvest, and safety. He has B.S., M.S., and Ph.D. degrees in agricultural engineering from Iowa State University. Mark was raised on a crop and livestock farm in western Illinois. Current projects include pesticide and fertilizer application, equipment clean-out for identity-preserved crops, and energy efficiency of field operations. He’s regularly cited as a farm equipment source in national media such as Corn-Soybean Digest and Farm Industry News. A precision nitrogen applicator design developed by a team led by Dr. Hanna was recognized as one of the ten top design innovations in the last 20 years by the American Society of Agricultural and Biological Engineers.